Rotary jar



June 5. 1928.

c. v. NORTH ROTARY JAR Filed Novo.. 1922 with a shortportion of the lduce Aan eiiicieiit rotary jar,

Patented June 5, 19228.

PAT-ENT OFFICE.

I CHARLES v. NORTH, or san Garmin., CALIFORNIA.

ROTARY JAB.

Application led November 20, 1922. Serial No. 602,183.

This invention relates to rotary jars such as used in drilling oil wells or any like operation. The general object of the invention is to produce a jar having simple means for enabling water to be carried through the jar to the tool at the bottom of the well, and having' means for effectively packing the jar to prevent loss of the water; also to provide a jar which will have a construction enabling it toelectivelyresist the blows in jarring, and impart the rotary-movement from the rotary device at the mouth of the well to the tool at the bottom of the iwell, Further objects of the invention will appear hereinafter.

The invention consists in the novel parts and combination of parts to be described hereinaftenfall -o whichA contribute to pro- A preferrd'embodiment of the invention is described '.in the following speciication while the broad scope of the invention ,is pointed out in the appended claims.

Of the drawings: y

Fi re 1 lis aside elevation of the rotary jar s owing a portion of the upper string of pipe and a portion ozty the lower string of pi ebroken away. t

ig. 2 is .a vertical section through the upper ortion of the jar and showing the, connection of then. per end of the plunger to the lower end o the pipe vstring which leads l.upwardly to the -rotary d evice; the lower portion of the jar 1n this .View is broken away.

Figu is a view similar to Figure 2 showing ,thev lower portion of the jar together pipe string which i is', connected with the bit or other tool at plunger. I also the bottom of the well.

Fi 4 is a cross section on the line 4-4 of Bigure2 upon an enlarged scale and further illustrating details of the jar device.

Thel rotary jar comprises a lunger 1 which has a neck at its upperen of ,circular cross-section, and is of tubular form so that it presents a bore 2 to carry water` downwardly from the upper piping 3 which is connected above to the rotary device; this plunger yis connected by a joint 4 and a plunger cap 5 -with the upper end of the rovide a barrel 6 which cooperates with t e plunger in the jarring, movement. For this purpose the plunger and barrel have interlocking means, that` is to say, one of the parts carries a lug and the other carriesf a recess to cooperate with the lug to enable as rotary movement to be iinparted through the jar as well as the jarring movementl For this purpose I provide the lower end ofthe plunger with lug means, preferably in the vform of two diametrically opposite lugs 7 which are received in two diametrically opposite recesses, grooves or `slots 8, which are cut longitudinally in the inner face of the shell 9 o the barrel which extends down from the upper head of the barrel, the said upper head being integral with the shell. In this way a shoulder 11 is formed on each side of theplunger which will be engaged by its corresponding lug 7' 'engaged by the lugs in the downward jarring movement.

The recesses or grooves 8 and the lugs 7 are preferably of dove tail `form so that theyv will fit to ether, see Figure 4.

I provi e means for packing the plunger vat the upper and lower end of the barrel.

For this purpose the plunger includes a tail pipe 14 having a cylindrical outer face; this tail pipe is secured in the lower end of the body of the plun er so as to communicate with the bore oft e plunger and cooperate with this bore to carry down4 the 'Circulating water. 'I'his tail pipe extends downwardly through the lowei` head 12, which has a circular central opening to guide it. The lower head is provided with` a stuiilng box '15 carrying suitable packin 16 held in place by a gland rin 17 which is threaded in the wall rorf-the stu ng box and which 'may be screwed in" by means of a Spanner wrench. The lower end of the head 12 has a coupling 18 screwed onto it and the lower end of this coupling 18 connects withv the pipe string 19 which extends down to the rotary tool at the bottom of the well.

The upper end of the barrel is-provided with a stuffing box 20 which is formed in a nut 21 having screw connection with the uper end of the lunger, .and the packing 22 in this stuing x is squeezed by a gland 'ring 23 similar to the gland ring 17 and is screwed tight in the stung box by means of a Spanner wrench.

It Wiil be evident that a rotary jar em bodying my invention enables the rotary movement to be imparted from the side faces 24 of the lugs to the side faces 25 of the slots or recesses 8. Furthermore the length of the lugs 7 is about half the length of the slots or recesses 8 and this enables an effective jarring movement to be impartedY from the plunger to the barrel either in an upward direction ora downward direction. When the coupling 18 is screwed up tight its upper face 27 seats against the lower end of the lower head 12 so that the jarring movement is not imparted through the thread connection but directly from the head 12 to the coupling 18.

lit will also be evident thatthe construction of the jar enables water; to be carried through it atall times whenever `desired to deliver the same to the tool at the lower end of the well. 4

The form of the plug 12 especially' is adapted for receiving the blow from the jar; in other Words, the opening through it is round so that there are no angles where a crack would tend to start.

llt is understood .that the embodiment of the invention described herein is only one of the many embodiments this invention may take. and ll do not wish t0 be limited in the practice of my invention nor in my claims to' the particular embodiment set forth.

llz'1`eaturesof my improvement may be applied to a jar regardless of whether it is arotary jar or not.

lt will be noted that in the operation of this tool, the lugs 7 are in constant engagement with the side faces 25 of the grooves or slotsS in which they run.

I claim:

1. ln a rotary jar, the combination of a barrel having a head at its lower end, with means for attaching the head to a tool string, and having a head at its upper end, a tubular plunger having a neck of circu lar cross-section at its upper end mounted to barrel in any position of the plunger in the barrel, said lug being capable of striking either of said heads to impart a jar from the plunger to the barrel, means for packing the circular neck of said plunger at the upper head, and means for packing the plunger at thevlower head.

2. In a rotary jar, the combination of a barrel having a head at its lower end, with means for attaching the head to a toolstring, and having a head at its upper end, a tubular plunger having a neck of circular cross-section at its upperend mounted to slide up and down through the last named head, said plunger being movable up and down in the barrel with equal freedom, and having oppositely disposed lugs, said barrel having oppositely disposed recesses receiving the lugs and cooperating with the same to enable the plunger to impart rotary movement to the barrel, the said lugs being shorter than their recesses, to enable the plunger to be moved up and down so that the lugs strike the ends of the recesses to impart a jar from the plunger to the barrel, a stuffing box in the upper head with packing for tlie cylindrical neck, said plunger having a tail pipe communicating with the bore of the tube of the plunger and cooper ating with the same to f' conduct water through the jar, said tail-pipe extending through the lower head of the barrel and having a cylindrical outer face, and a stuffing box at the lower head for packing the tail pipe.

Signed at L os Angeles, California, this 13th day of November, 1922.

onannns v. NORTH. 

